Users of recent 15-inch MacBook Pro models need to install an updated version of macOS that was just released this morning. Details are scanty, but Apple says this fixes an unspecified firmware issue related to the T2 security chip.
Apple’s support site indicates, “The MacBook Pro Supplemental Update addresses a firmware issue affecting 15-inch MacBook Pro computers with T2 Security Chip, and is recommended for all users.”
It’s an enhanced version of macOS Mojave 10.14.5, which was released earlier this month.
More about the MacBook Pro’s T2
The Apple T2 chip is buried at the heart of almost all macOS OS devices introduced since late 2017. This co-processor does so many jobs it has its own operating system separate from macOS. The T2 with Bridge OS is the disk controller for the hard drive, it adds intelligence to the FaceTime Camera, enables “Hey Siri,” and even oversees the macOS boot up process.
It’s a complicated piece of kit, and one that apparently needed a tweak today. It’s been blamed for crashes in the past.